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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


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Vulnerability Assessment Details

OpenSSH Channel Code Off by 1

Vulnerability Assessment Summary
Checks for the remote OpenSSH version

Detailed Explanation for this Vulnerability Assessment

You are running a version of OpenSSH which is older than 3.1.

Versions prior than 3.1 are vulnerable to an off by one error
that permits local users to gain root access, and it may be
possible for remote users to similarly compromise the daemon
for remote access.

In addition, a vulnerable SSH client may be compromised by
connecting to a malicious SSH daemon that exploits this
vulnerability in the client code, thus compromising the
client system.

Solution : Upgrade to OpenSSH 3.1 or apply the patch for
prior versions. (See: http://www.openssh.org)

Network Security Threat Level: High

Networks Security ID: 4241

Vulnerability Assessment Copyright: This script is Copyright (c) 2002 Thomas Reinke

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